Enable to keep a domain

#790

config/locales/admin/domains.en.yml

@@ -14,6 +14,11 @@ en:
 
       edit:
         add_new_status_btn: Add new status
+        keep_btn: Remove deleteCandidate status
+        keep_btn_confirm: Are you sure you want to remove deleteCandidate status?
+
+      keep:
+        kept: deleteCandidate status has been removed
 
       force_delete_dialog:
         title: Force delete

config/routes.rb

@@ -191,6 +191,10 @@ Rails.application.routes.draw do
       resources :pending_updates
       resources :pending_deletes
       resource :force_delete, controller: 'domains/force_delete', only: %i[create destroy]
+
+      member do
+        patch :keep
+      end
     end
 
     resources :domain_versions do